# Geometry Forum

Geometry Help Forum: Euclidean, basic geometric proofs, volumes, perimeters

1. ### Reflection of 3-D shape across a plane = rotation across fourth dimension?

• Replies: 0
• Views: 704
Feb 23rd 2011, 11:17 PM
2. ### Indirect proof

• Replies: 2
• Views: 657
Feb 23rd 2011, 01:22 PM
3. ### What do you call a cone that is shaped like an ellipse?

• Replies: 1
• Views: 579
Feb 22nd 2011, 09:02 PM
4. ### [SOLVED] the equation of a circle

• Replies: 0
• Views: 446
Feb 22nd 2011, 02:53 PM
5. ### [SOLVED] radius and height of cone

• Replies: 1
• Views: 671
Feb 22nd 2011, 02:06 AM
6. ### I need to find diameter of a given section of a sphere

• Replies: 2
• Views: 782
Feb 21st 2011, 10:51 PM
7. ### Verify that a point in 3d (euclidian) space lies OUTSIDE a particular pyramid?

• Replies: 0
• Views: 490
Feb 21st 2011, 07:47 AM

• Replies: 8
• Views: 496
Feb 21st 2011, 05:57 AM
9. ### lattice points

• Replies: 1
• Views: 4,157
Feb 19th 2011, 09:58 AM
10. ### Pythagoras' Theorem.

• Replies: 2
• Views: 708
Feb 19th 2011, 03:08 AM
11. ### AMC problem, finding the area inside a circle but outside a square

• Replies: 4
• Views: 1,554
Feb 18th 2011, 12:48 PM
12. ### proof ques

• Replies: 5
• Views: 507
Feb 18th 2011, 05:11 AM
13. ### Help with a question about Steiner Points (triangles)?

• Replies: 0
• Views: 455
Feb 17th 2011, 06:23 PM
14. ### cubic lattice doubt...

• Replies: 1
• Views: 393
Feb 17th 2011, 02:22 PM
15. ### 2D and 3D Coordinates

• Replies: 1
• Views: 499
Feb 17th 2011, 07:12 AM
16. ### concurrency.

• Replies: 0
• Views: 399
Feb 16th 2011, 09:01 AM
17. ### Expressing angles

• Replies: 2
• Views: 654
Feb 16th 2011, 05:18 AM
18. ### Coordinate Geometry

• Replies: 1
• Views: 449
Feb 15th 2011, 11:06 PM
19. ### how can i get largest square in circle

• Replies: 4
• Views: 1,799
Feb 15th 2011, 05:36 AM

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### cosx= .4583?

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